Document VJBLd0r1ddmXpb8RVqON1zzxg

Lake Charles VCM Plant CERTIFIED MAIL 8090816 RETURN RECEIPT REQUESTED April 23, 1984 **V \ Jin' J 'VV 'T S.K*' } Conoco Chemicals Company A Division of Conoco Inc. P.O. Box 605 Westlake. LA 70669 13181 491-5211 ?c m2.r&\ FfooTc". Conv . Fils' - / Z y'. tf- ' X-F: - Myron Knudson Water Management Division Environmental Protection Agency Region VI First International Building 1201 Elm Street Dallas, TX 75270 Dear Mr. Knudson: In accordance with the conditions of the Conoco Chemicals Company VCM Plant's NPDES Permit No. LA0003476 we are informing your office that the discharge limitation for pH at the 001 outfall was exceeded on April 18, 1984. The pH of the combined wastewater at outfall 001 was above the NPDES Permit limit of 9 units (approximately 11) from 10:30 am to 5:00 pm on April 18. This exceedence resulted from an inadvertent discharge of incinerator wastewater through the 001 outfall from 9:45 am to 4:15 pm on April 18. This wastewater is normally routed to the Conoco Chemicals Company Lake Charles Chemicals Plant's wastewater treatment system where it is treated and discharged via a permitted outfall. Immediate action taken to resolve this problem was to reroute the incinerator wastewater to the VCM Plant's secondary wastewater treatment system where it was treated and discharged via the permitted 201 outfall. Evaluation of a proposed piping change to prevent future incidents of this type will be conducted. If you have any questions concerning this report, please contact Ron Bryan, Chief Process Engineer, at (318) 491-5062. Sincerely, R. A. Conrad Plant Manager br bcc: JWW-RB-PLF-MLA-DLD-SCR-MGH-JCL SAL 000090709 Lake Charles VCM Plant CERTIFIED MAIL #8091001 RETURN RECEIPT REQUESTED (conoco) Conoco Chemicals Company A Division of Conoco Inc. P.O. Bo* 605 Westlake. LA 70669 (316)491-5211 received JAN 13 `84 Route:_________ January 9, 1984 Copy: File: X-F: - a/J_ Myron Knudson Water Management Division Environmental Protection Agency Region VI First International Building 1201 Elm Street Dallas, TX 75270 Dear Mr. Knudson: In accordance with the conditions of the Conoco Chemicals Company VCM Plant's NPDES Permit No. LA0003476, we are informing your office that the analytical results of the effluent wastewater at Outfall 201 indicate the limitation for biochemical oxygen demand (BOD^) was exceeded on December 30, 1983. The effluent wastewater discharged from the VCM Plant's secondary wastewater treatment system at Outfall 201 showed a BODr analysis of 1743 lbs. on December 30, 1983. Although the 201 Outfall analysis showed 1743 lbs. of BOD, the in-plant quality control sample point directly up-stream of the 201 Outfall showed a composite BOD analysis of 1350 lbs. on December 30, 1983. We believe that this discrepancy is a result of the 201 Outfall sample bottle having overflowed on December 30, 1983, caused by the effluent wastewater flowrate being too high for the 201 Outfall automatic sampler set point. For this reason we believe the analysis of the sample taken at the quality control sample point directly up-stream of Outfall 201 is more representative of the actual effluent wastewater than the sample taken at Outfall 201. Therefore, we feel that the limitation for BOD at Outfall 201 was not exceeded, although the analytical results indicate as such. The overflowing of the 201 Outfall sample bottle is also the likely cause for the apparent exceedances of the TSS limitations as previously reported for December 30, 1983 and January 1, 1984. This matter will be discussed in a future letter. If there are any questions please call Ron Bryan, Chief Process Engineer, at (318) 491-5062. Sincerely, R. A. Conrad Plant Manager bCcCc: -MGH-BIR-JCL SAL 0000907.10